package demo3;
class Student22{
    public Student22 (){
        System.out.println("调用了无参构造方法");
    }
}
public class d5 {
    public static void main(String[] args) {
        System.out.println("声明对象...");

        Student22 stu = null;
        System.out.println("实例化对象...");
        stu = new Student22();
    }
}

